Controller for electric motors.



H. H. CUTLER.

CONTROLLER FOR ELECTRIC MOTORS. APPLICATION FILED FEB, I0, 1902- RENEWEDJUNE 15 1907- 1,154,976. Patentedsept. 28, 1915.

, 3 SHEETSSHEET 1- $3 72 5 5,51 [71 wen Z07" fizzy;

H. H. CUTLER. CONTROLLER FOR ELECTRIC MOTORS. APPLICATION FILED FEB. 10.1902. RENEWED JUNE 15. 1907.

1, 1 54,976. Patented Sept. 28, 1915.

3 SHEETSSHEET 2.

Fly-5 H. H. CUTLER.

CONTROLLER FOR ELECTRIC MOTORS. APPLICATION FILED FEB. 10. 1902. RENEWEDJUNE 15. I907.

1,154,976. PatentedSept 2 1915.-

3 SHEETS-SHEET 3 cps 5 s STATESPATENT OFFICE.

HENRY H. CUTLER, or MILWAUKEE, WISCONSIN.

CONTROLLER FOR ELECTRIC MOTORS.

Specification of Letters Patent,

Patented Sept. 28, 1915.

Application filed February 10, 1902, Serial No. 93,387. Renewed June 15,1907. Serial No. 379,178.

To all whom it may concern:

Be it known that I, HENRY H. C-U'rmin, citizen of the United States,residing at Milwa-ukee, in the county of Milwaukee and State ofWisconsin, have invented a certain new and useful Improvement inControllers for Electric Motors, of which the following is a full,clear, concise, and exact description, reference being had to theaccompanying drawing, forming a part of this specifi-v cation.

My invention relates to improvements in controllers for electric motors,and has for its objects the provision of means for automaticallycontrolling a variable resistance adapted to be included in a motorcircuit.

My invention is illustrated in the accompanyingdrawing in which Figure 1is a face view of one form of the controller mechanism; Fig. 2. is adetail view of the releasing stop of the pawl carried by the operatinglever; Fig. 8 is a bottom plan view of the circuit breakerand armconnected with the core of the master solenoid; Fig. i is a detail viewof the retaining magnet looking in the direction of the arrow in Fig. 1;Fig. 5 is a front view of a different form'of the apparatus; Fig. 6 isan edge View of the same; Fig. 7 is a detail view of the retaining orreleasing magnet; Fig. 8 is a side view of the mercury tilttor switchconnected by the solenoid; Fig. 9 is a plan view of the same; Fig. 10 isa diagram of. circuits emploved in connection with the device shown inFig. 1; and, Fig. 11 is a diagram of the circuits of the device shown inFig. 5.

Like letters refer to like parts in the several views. 7

The several parts of the apparatus are mounted upon a suitable slate orinsulating base, 2, which is adapted to be secured against a wall orother support by means of suitable screws, 3. This apparatus includes astarting or regulating resistance, 4:, consisting of several sectionsconnected between the contacts, 5, arranged circular upon said base. Anarm, 6, is pivoted at 7, upon sai base and carries a suitable brush 7,adapted to c06perate with the contacts, 5, in the movement of the arm,6, to cut out or cut in the resistance 1. The brush 7 is of any suitablekind to make electrical contact with the contacts, 5, and is preferablyyieldingly supported in said 'arm' as by means of the leaf spring, 8,resting at one end upon the raised rib 8", formed upon the arm 6, andcarrying at the other a small block secured by screw 8 adapted to bearupon the upper end of the brush, 7. A coil spring is placed between thehead of a screw 8. and the upper face of the said leaf spring. Thisconstruction is usual and well understood. An additional brush, 9, iscarried by said arm, and is adapted normally to rest upon a suitablecontact, 10, shown in Fig. 10, and to make connection with. the contactstrip, 11, when it is out of normal position, said brush 9, being of anysuitable construction to accomplish the desired results. Suitablebuffers 12 and 13 are provided for said arm, to limit its movement ineither direction. The upseries of ratchet teeth, 15, as shown, which areadapted to be engaged by a dog, 16, pivoted at 17, upon a vibratinglever or arm, 18, a spring, 19, fixedly secured to the arm, 18, andpressing against a pin, 20, upon the dog, 16, tending to hold theforward end of said dog against or in engagement with the ratchet teeth.15. in the present instance is in the form of a set screw, threadinginto a bar or post, 22, secured to the base, 2, by. means of thethreaded extension, 23, and nut, 24, strikes against the dog, 16, whenthe arm, 18, is in its normal-position to force the said dog away andout of the line of the ratchet teeth, 15. The forward end nected by alink, 25, with the core, 26, as shown, of a solenoid, 27, the frame, 28,of which is suitably secured as by means of screw-bolts, 29, shown indotted lines to the insulating base, 2. This solenoid is preferablyprovided withasoft iron cap, 30, having a conical cavity on its lowerface adapted to accommodate the corresponding end, 31, of thecore, 26,which thus strengthens the action ofthe solenoid. When the solenoid isenergized, the core, 26, is lifted and the arm, 18, drawn up to causethe dog, 16, to engage the ratchet teeth, 15, and thereby move the arm,6, about its pivot to cause the brush, 7, to successively'engage theresistance contacts 5, and. the brush 9, to move from contact 10 tocontact 11.

In order to retain the arm, 6, in the position to which it is moved bythe arm, 18, a pawl, 82, is provided, the free end of A. suitable stop,21, which i of the arm is conteeth, 15.

which is adapted to engage with the ratchet This pawl is pivoted upon apin, 33, and is provided with a beveled rearwardly extending end, 34,the said end be-- of which are extended by the pole pieces 39 and 40, inproximity to the armature, 36. This magnet may be secured to the base,2, by means of screw-bolts, 42 or other suitable devices. A leaf spring,43, is secured at its rear end to the armature by screws 3 44, and itsfree end is adapted to bear against the rear end of the pawl, 32, thustending to force it against the pin, 35, as shown in Fig. 1. A suitablebuffer or stop, 45, is provided for said armature and a lik stop 46, isfurnished for the arm, 18.

A bracket or laterally extending arm, 47, is secured to and carried bythe solenoid core 26. This arm is not parallel with the face of thebase, 2, but its free end, as shown in Fig. 3, is located closer theface of the base, 2, than the opposite'end. A reciprocating rod, 48,passes through anaperture in the free end of the bracket or arm, 47, andis guided at its upper end by a suitable bracket, 49;" A block or stop,50, is secured to saidrod and normally rests upon the arm, 47, and asuitable adjustable stop, 51, is carried upon the upper end of the rod,48. e

.A lever, 52, is pivoted at 53, upon the base and is provided with astrip of-metal, 62 and 62 upon each side of one end, said strips passingupon either side of the rod, 48. The lever is split at its opposite endand clamps therein a suitable contact, 52, which may be a carboncontact. A suitable solenoid, 53, is provided upon'the base and issecured in any desired way as by means of the clips, 54, securedtothe'frame of the solenoid, the core,55, thereof carries at its lowerend a, bridge contact,'56, which is adapted in its upper position to.engage suitable terminals, 57. At the side of these terminals, 57,carbon contacts or terminals, 58, are mounted, and are adapted tobeengaged by cotiperating contacts, 59,- carried upon the ends of a leafspring, 60, which is secured'to the bridge contact, 56, and is carriedlikewisevby the core, 55. As shown in Fig. 3, the carbon contacts, 58,are located some distance in front of the face of the base, 2, and inthe rear of the same as shown at 61 is-another contact against which thecontact, 52, carried by the lever 52 strikes. is extended as shown 1nFig. 3 and'engages The strip, 62, upon the lever, 52.

' a washer, 63 with its free end; whereby the for the lower end of thecore, 55. Binding posts, 65, 66, 67, 68, 69,70, and 71, as well.

as 72, and 73, are provided upon the base, 2, to suitably connect theapparatus in circuit. Connecting wires between the several parts andbinding posts are extended preferably upon the rear of the base insuitable slots or grooves which may be then filled with insulatingcompound in the usual manner.

It will be apparent from the above description that when the solenoid,27, is operated, the arm, 18, is lifted and the arm, 6, is rotated. Thepawl, 32, serving to prevent the same from returning to normal positionas long as the magnet, 41, is energized. When the core, 26, lifts thearm, 47, it carries the stop 50, against the end of the lever, 52, whichmoves the contact, 52, away from the coiiperating contact 61. In theopposite movement of the core, the contacts, 52 and 61 remain apartuntil the stop, 51, uponthe rod, 48, in its downward movement strikesthe end 'of the lever,-52, and causes them to engage. It will also beseen that when the arm, 6, reaches the highest point, the insulatingblock 14 carried there by will be placed in the path of the lower end ofthe rod, 48, and prevent it falling to again operate lever,"52 andthereby close contacts, 52, and 61 together. The object 'of this will beexplained in connection with the diagram. The ratchet teeth andretaining pawl are preferably so formed that when the magnet isdeenergized, the teeth them-- selves will tend to disengage the pawl.

The circuit arrangement of the apparatus is shown in Fig. 10, in which amotor, 75, is

adapted to be controlled thereby. As shown, this motor may be employedfor pumping water and is automatically started and stopped by a float,77, in the tank, 76, a rope 78, passing therefrom over suitable pulleysand supporting the weight, 79. By

means of suitable stops, 80, upon the rope, upon opposite sides of thelever, 81, a weighted lever, 83 is actuated to quickly open and close aswitch 82. This switch is of ordinary well known construction and istherefore not shown in detail. By means of the weighted arm, 83, whichcarries suitable stops, 84, to engage the arm, 81, the switch arm, 82,is quickly thrown into engagement with the switch contacts, 85, when thefloat falls a predetermined distance, and is dis engaged therefrom whenit rises to a certain height. A knife switch, 86, is placed in the maincircuit.

The operation is as follows: The switch, 86, being closed, and with theswitch 82, open in the position shown, the circuits are open and allparts are in normal position.

When the liquid in the tank, 76, falls, the

stops, 80, lift .85, and arm, 82, of

I thence through conductor, 93, to the retain- 10, through the rheostatarm, 6, to con-' operatingthe retaining a path.

I 100, to and through vnoid, 53, serves ing magnet 41, over conductor,94, contact ductors 95 and 96, to the opposite side of the main circuit.This has the effect of oper ating solenoid, 53, thereby bridgingtogether contacts 57 by means of the contact, 56, and magnet, 41, tocause the pawl, 32, to engage with the ratchet teeth upon the switcharm, 6. The closing of the contact, 56,'with contacts, 57, by the soletoclose alcircuitthrough the shunt coil of the motor overthe followingFrom conductor, 89, over conductors 97 and 98-, contacts, 57 and 56,conductor, 99, the shunt coils, 101, of the motor, 75, to the oppositeside, 96, of the circuit. From the point, same circuit an additionalpath for current is completed through the series coil, 103, of themotor, 75, thence and by way of conductors 104 and 105, to theresistance 4. From thispoint the circuit is completed through theresistance, 4, through-the rheostat arm, 6, conductors, 95 and 96, tothe opposite sideof the circuit.

"40 The motor is thus permitted to startbu-t has included in its circuitthe Whole of the resistance, 4. At the same time a path for current iscompleted from the contacts 56 and -57 a,nd 61 through the lever, 52,conductor, 106, to the solenoid, 27 thence by way of conductor, 107, tothe arm, 6, and over wires, 95 and-96 to the opposite side of thecircuit. "The solenoid 27, which may be termed the master solenoid isthus energized and lifts its core and by means of the connecting link,25, arm, 18, and pawl, 16, moves the rheostat arm, 6, upward so that itsbrush 7 engages the succeeding contact of the series to cut out aportion of the resistance 4. In this moyement 6, the brush,- 9,- leavesthe contact, 10, and comes into engagement with contact, 11, withwhichit continuously engages when out of normal position. This has theeffect of cutting lamps, 87 into the circuit ofthe magnet, 41, andsolenoid, 53,to cut down the consumption of currenttherein and Stlll.

permit enough toflow tomaintain them actuated until their circuit isopened when they cannot be again energized until arm,

stop, 50, to engage C and the opposite end of the As the core, 2 48,travels do 102, upon this" through its armature 7 arm,

of. the arm,

6, returns tonormal position. The contacts 10, and 11, are close enoughto prevent deenergizing the 'coils as the brush, 9, passes. from one tothe other. As the solenoid core rises, thearm, 47, affixed thereto, andcarry ing the reciprocating rod, 48, causes the the end of the lever,52, the circuit between the contact, 61 lever. This opens the circuit ofthe solenoid 27 causing the same to be denergized and permitting itscore,'26 as well as thearm, 18, to fall; the pawl, 32, being heldagainst teeth, 15,- by the magnet, 41, prevents the arm, 6, from ginningto normal position.

and open falls, the reciprocating rod,

the ratchet thereon engages the end of the lever, 52, and

closes the contact at frictionally' sustained as before explained sothat it will remain in the upper or lower position until positivelymoved therefrom by one of the stops'on he rod. The solenoid, 27, isagain actuated as before, and the rheostat arm, 6, is again moved to cutout more of the resistance, 4; This operation is continued until thewhole of the resistance is cut out at which time the motor will havedeveloped suflicientspeed to prevent in ury thereto by the cutting outof the whole of the resistance.

At the last movement of the arm, 6, the insulating plate or block, 14,carriedthereby is disposed in the path of the downwardly reciprocatingrod, 48, carried by the solenoid 'core, which prevents it from fallingand again closing the circuito-f the solenoid, 27 through the lever 52,and contact 57. The motor is operated under these conditions as long asnecessary or until the float, 77 ,rises to the desired height when thearm, 81, throws the weighted lever, 83, to the opposite side of its.pivot thereby quickly opening 82, The opening of this circuit has the"effect of deenergizing solenoid,"53,- thereby opening the circuitthrough the motor and resistance and at the same time dee'nergizingmagnet, 41, thus releasing the rheostat arm,- 6, which descends bygravity to its normal position, thus cutting in again the whole of theresistance 4. Whenever lever, 18, is in normal position the screw, 22,forces pawl, 16, away from teeth 15, whereby whenthe arm is released bymagnet 41, the said arm, turns to normal position. Of ,course, theretaining magnet 41 'may be connected in circuit in other ways. Forinstance,"it may be connected in the fieldcircuit of the motor ashereinafter described. a

Fig. 5 shows a different form of the invention in which a verticallymovable arm or frame, is employed for cutting out the resistance in themotor circuit. In this construction the solenoid, which may be ter'me61. The said lever 13 I i the switch 6, readily readapted.

"Suitable brushes,

a master solenoid, is mounted upon a base f 112 of slate or othermaterial, in any suitable way, as by the bolts, 111, passing throughsuitable clips formed upon the frame of the solenoid. As shown in Fig.6, this solenoid is supported at some distancefrom the face of the base112, to provide room for the reciprocation beneath it of the resistancecontrolling arm, 116. An arm or bracket, 113, extends downwardly fromthe frame of the solenoid,'110, and in its lower end is pivoted a lever,114, carrying a suit able pawl, 115, on its free end, which isadapte'dtto engage ratchet teeth, in the front edge of the vertical rod;116; this rod is to reciprocate vertically and carries at its lower enda cross bar or frame, 117. 118, are carried by this frame or cross bar,and are adapted to engage with the contacts, 119, associated with theseveral sections of the resistance in the usual way. These brushes, 118,are secured in position by means of a plate, 120, secured to the upperedge of projections, 121, formed on the upper edge of the cross arm,117. These parts together with the upper edge of the bar form arectangular frame in which the brushes, 118, which may be of carbon orother suitable material slide. The two brushes 118, in each such frameare pressed down against the contacts, 119, by suitable plates orstrips, 123. The cross bar, 117, has a raised rib 122, along the lowerside, at each end opposite the frames carrying the brushes, 118- and theplates or strips, 123, rest at their lower ends upon these ribs and attheir upper ends upon the brushes, 118, these brushes being formed withcylindrical extensions, 118*,or these extensions may be blocks securedto the ends of the strips, Coil springs, 124, are then placed betweenthe outer faces of these strips, 123, and the heads, of suitablescrew-bolts, 125, which are threaded into the cross bar, 117, and lockedin place by suitable lock nuts, 126. A guide 116% is providedfor thelower end of :the rod, 116, and buffers, 116 are provided for the bar117. Binding screws, 127, may

be employed to secure the sections of the resistance to the contacts,119. Additional contacts, 128 are provided to engage the cross arm inits upper position and assist in completing the circuit through themotor.

circuit. The beneath the These contacts are suitably connected in thesolenoid en /.129, is extended frame of the solenoid and is providedwith a slot at its lower end in 114 works. Rollers 130, the said lever,

pawl 115 is conar, 116, and in normal position restsagainst a suitablestop, 130 which extends upon both sides of the strip, 116, and forms aguide therefor the pawl'is thus held out of the path of the ratchetteeth on the bar, 116 when in normal position. A retaining magnet, 131,is suitably mounted upon the base, 112, and is provided with an armature132, pivoted at 133 at one end of the magnet and is normally held awayfrom the other pole of the magnet by means of a coiled spring, 134,suitably arranged for the purpose. At its opposite end, the armature,carries a pawl, or dog, 135, adapted to engage the ratchet teeth uponthe bar, 116, when the magnet is energized. A suitable adjusting screw,186, is provided to adjust the movement of the armature.

y In order to open and close the circuits throughthe solenoid by its ownaction, a mercury switch, 140, is provided. This switch is connectedwith the core of the solenoid by means of the connecting link, 141, anda'forked extension, 142, from the core, passing upwardly through theupper end of the frame of the solenoid. The switch is preferablycomposed of a block of fiber, pivoted at 140' upon the base, 112, andhaving an aperture "extending longitudinally therethrough. Suitablescrew-bolts, 1.43 are placed in the ends of the aperture to close them.Contact terminals, in the form of screws, 144, project into one end ofthe opening and are adapted in the position shown in Fig. 5 of thedrawing to be connected together by the mercurywvithin the switch. Thesescrews are provided with ad justing and. locking nuts, 145, and withbinding nuts, 146, to secure the circuit wires thereto. The centralaperture, through the block has preferably a central restricted portion,147, which is adapted to be further closed by a screw, 148.. .By thismeans it is possible to adjust the passage way between the end portionsof the chamberedblock and thus vary the time required for the mercury toflow from oneend to the other.

In Fig. 11, the diagram of circuits employed with this last form of theinvention is shown, A switch, 150, closes circuit from the power circuitto the apparatus, a motor, 151, being controlled thereby. It is apparentthat the apparatus shown in this figure may be employed with theautomatically controlled switch of Fig. 10, or in other 'de-' siredrelations, but it is ample for the purpose of'describing the operationto merely shoW the closing of the circuit the switch, 150. When nocurrent is flowing the parts are shown. in the position in the diagram.

,When the, switch, 150, is closed, however, a

path for current from the conductor, 152, is

completed, through the contacts of the merover. conductor, 153,ofsolenoid', 110, conto the opposite side-of same time parallel mercuryto fall. The traveling through the shunt coil of the tor, 156, retainingmagnet, 131, conductors, 157 and 155, to the opposite side of thecircuits A third path for current is also provided, through the armatureof the motor, 151, conductor, 158, theresistancecontrolled by thecontacts, 119, and the cross arm, or frame, 117 and conductor, 155, tothe opposite side of the circuit. This motor is thus permitted to startbut resistance, 119, in its armature circuit. The closing of the circuitthrough the mercury switch causes the solenoid, 110, to. operate thuslifting the cross bar, 117, and cutting out a portion of the resistance,119. When the switch is tilted upon its pivot, 142, the flows to theopposite e dv thus breaking contact with the screws, 144, and openingthe circuit through the Winding of thesolenoid. This causes the,solenoid core bar, 117, is maintained lifted by 'thepawl of theretaining magnet, 131, engaging the rack 116. falling of the core, 129,-serves to tilt the its first position and the operation is repeateduntilall the retilt the speedof and the cutting out of the resistance,

' When the switch, 150, is open,

therein, to accomplish the gages contacts,

the current and sistance is cut out of the motor circuit. At thelastoperation of the solenoid the stop (see Fig. 6), secured to the bar,116, in any desired way is lifted into the path of the mercury switchand prevents it from tilting again toallow the mercury therein to closetogether the contacts 144, whereby the solenoid circuit remains open aslong as the magnet 131 is energized. The stop, 160, may be adjustablysecured to the said rod, 116, and it may be given a slight longitudinalplay or lost motion, as by means of slots desired operation. Byadjusting the screw, 148, of the mercury operation of the solenoid 119,from the motor circuit may be varied as desired to suit differentconditions of use. The bar of frame, 117, in its raised position en-128, which carry the bulk of thus save the other contacts fromdeterioration. F

the retaind and the bar, thus in magnet, 131 is-deenergize 11isypermitted to fall by gravity,

:cutting in the resistance as in the first pos tionfand returning allparts to normal positionl.

Having described my claim" as new and desire to secure invention what Iby Letters 1,.- In an electriccontroller in combinatlOIly]. resistancecontrolling member, an op.-

- controlling :said operating member normalposition, means sistancecontrolling, member against return said resistance member being releasedfrom when the latter is in for holding said reerating. member therefor,

movement after/operation by said operating The motor, conduc-l" with allof the tion upon movement ,member pivoted to a pivoted pawl carried by-solenoid plunger combination, a vertical supporting series of ratchetteeth, a magnet mounted upon said base,

member,

part to energize and denergize said solenoid atintervals and meansautomatically locking said switch against further operaof saidresistance varying element to a predetermined position.

3. In an automatic accelerating device for electric motors, incombination, a resistance varying element biased toward initialposition, said-element being provided with a series of ratchet teeth,means for imparting a step by step movement to said element including apawl adapted to engage the ratchet teeth of said element, means fordisengaging said pawl from said ratchet teeth after each stepofoperation of said element and an electromagnet for holdingsaid elementagainst return movement.

4. In a controller for electric motors, in combination, a supportingbase, a rectilinearly movable contact member mounted thereon, a solenoidmounted upon said base and having, a movable plunger, a member pivotedto a-fiXed part and operatively connected to said solenoid plunger and apivoted pawl carried by said pivoted member to cobperate with saidratchet teeth on said contact member, said solenoid plunger uponsuccessive reciprocations thereof operating said pivoted member toimpart a step by step movement to said contact member.

5. In a controllerv for electric motors, in combination, a supportingbase, a rectilinearly movable contact-carrying member mounted thereon, asolenoid mounted upon said base andhaving a movable plunger, a.

fixed part and operatively connected to said solenoid plunger, a saidpivoted memwith said ratchet teeth, said upon successive reciprocationsthereof operating said pivoted member to impart a step by step,movementto said contact carrying member and means for disengaging saidpawl from said ratchet teeth when said pivoted memberis in normalposition. v a I 6. In a controller for electric motors, in base, avertically disposed longitudinally movable bar mounted thereon andprovided with a frame her to cooperate a member to a portion of saidmagnet frame and proin combination, a resistance pivoted vided with apawl adapted to engage said ratchet teeth and said bar and anelectromagnetic winding mounted in said magnet frame and having amovable plunger operatively connected to said pivoted member to actuatethe same to impart a step by step movement to said bar.

7. in an automatic starting device for electric motors, in combination,asolenoid having a reciprocating core, a rectilinearly movable bar, acontact member carried by saidbar, a plurality of resistance contactsarranged to be successively engaged by said contact member, connectionsfor causing said bar to move with the core of said solenoid in onedirection and permitting the core of said solenoid to move independentlyof said bar in an opposite direction, an au tomatically operated switchfor intermittently energizing and deenergizing said solenoid to causethe same to impart, through said connections, a step-by-step movement tosaid bar, and a retaining magnet adapted to hold the bar in thepositions to which it is moved by said solenoid.

8, In an automatic starting device for electric motors, in combination,a solenoid I having a reciprocatlng core, a rectilinearlv movable bar, acontact member carried by said bar, a plurality of resistance contactsadapted to be successively engaged by said contact member, a pivotedpawl actuated by the core of said solenoid, a toothed rack portion onsaid bar arranged to be engaged by said pivoted pawl to cause saidbar'to move with the core of said solenoid in one direction, said pawlbeing movable out of engagement with the rack portion of said bar whenthe core of said solenoid moves in the opposite direction, 'a switchactuated by the core of said solenoid for intermittently energizing anddeenergizing said, solenoid to cause the same-to impart, through saidpawl, a step-by-step movement to said bar, and a retaining magnet forholding said bar in the successive position to which it is moved by saidsolenoid. c 7 c 9. In combination, a slidingly mounted contact member, areciprocating operatlng member therefor, means for inherently connectingsaid contact member to and releasing the samefrom said operating memberupon reciprocations of said-operating member in opposite directions,said operating member upon successive reciprocations in the same adirection moving said contact member in a step by step manner, and amagnet for holding said contact member against return movement. a

- 10. In combination, a slidingly mounted contact member, areciprocating operating member therefor, means for inherently connectingsaid contact member to and releasing the same from \said operatingmember upon. reciprocations of said operating member in oppositedirections, said operating member upon successive reciprocations in thesame direction moving said operating member in a step by step manner, amagnet for holding said contact member against return movement, asolenoid for operating said reciprocating member, and means forautomatically energizing and deenergizing said solenoid upon movement ofsaid reciprocating member in opposite directions. r

11. In combination, a rectilinearly moving Contact carrying member, amember adapted upon movement in one direction to inherently connect withand move said contact carrying member, and when moved in the oppositedirection to inherently release said contact carrying member, aretainingmagnet for holding said contact carrying member against returnmovement, and an operating solenoid for said second mentioned memberalternately energized and deenergized upon reversals of the movement ofsaid member to cause successive movements thereof in the same directionto impart a step by step movement to said contactcarrying member. Inwitness whereof, I have hereunto subscribed my name in the presence oftwo witnesses,

t HENRY H. CUTLER.

I Witnesses:

W. CLYDn'JoNEs, M. R. Rocrrronn.

